{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-house-8cl5y4pc","versions":[{"created_at":"2026-06-11T01:39:28Z","element_count":72,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"916b2b6280172676947d6ab5cb69dd23b1bff80c2f14797dce20c32833ec1f5e","version":8},{"created_at":"2026-06-10T23:48:32Z","element_count":46,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"5829aa3b1483cb3b077b7485388eb55cc814848f119fffd6bba35fb0b633626f","version":2}]}